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Throughout the temperature range 166 K to 246 K the NCH3 resonance is sharp and unchanged. It was proposed that the t-butyl group of 14žPMDTA is unsymmetrically sited with respect to the coordinated PMDTA (Figure 6). The partial averaging of N(CH3 )2 resonances and the averaging of CH2 resonances all at lower temperatures was ascribed to fast rotation of coordinated PMDTA around the C−Li bond. Then, above 206 K, averaging of the broadened N(CH3 )2 doublet would be due to fast local reversible dissociation of N−Li coordination accompanied by inversion at nitrogen and rotation around the C−N bond prior to N−Li recombination.

There are four required elements of the density matrix, α |β , being one of the spin states of 7 Li. Because we use the quadrupole relaxation operator at the extreme narrowing limit, just one composite relaxation parameter jq sufﬁces to account for the contribution of 7 Li quadrupolar relaxation to the 13 C NMR line shape in this system (see equation 63), jq = 2 e2 Q h 1 30 τq (63) where Q, q and τq , are, respectively14, 16 , the 7 Li quadrupole moment, the electric ﬁeld gradient and the quadrupolar correlation time.